Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tool Talk Discussion Forum

ot/ Truck brakes

Welcome Guest, Log in or Register
Author 
Jack-Iowa

03-10-2006 15:29:36




Report to Moderator

I am confused. Brake pedal goes to floor. figure I would try bleeding them to see if all wheel cylinders are working. They all pushed fluid out. Master cylinder was full to start with. Pedal still goes to floor.
I figure master cylinder is good otherwise the wheel cylinders would not work.
what am I missing? Thanks




[Log in to Reply]   [No Email]
Jack-Iowa

03-11-2006 08:53:51




Report to Moderator
 Re: ot/ Truck brakes Ok can this be done in reply to Jack-Iowa, 03-10-2006 15:29:36  
Ok the Master is fine goes about an inch and holds steady with the plug.
Now lines to the wheels are steel lines.
Is there a way to test the booster? Or is that just the problem if wheels and master check out?
It is a GMC 6500 early 70"s truck
Thanks again



[Log in to Reply]  [No Email]
the tractor vet

03-11-2006 10:10:05




Report to Moderator
 Re: ot/ Truck brakes Ok can this be done in reply to Jack-Iowa , 03-11-2006 08:53:51  
Like i said before adjust the brakes up first before ya go and start buyen parts and tearing things apart 95% of all juice brake problems are due to brakes out of adjustment jack up each wheel and adjust them till they will not turn then back off , some of them old trucks have two adjusters per wheel then back off just enough for the wheel to trun and still hear a slight drag . The brake have to be kept up as they do not have self adjusters and when ya start having to pump them to get enough pedal to stop then they are out of adjust ment these are truck and not a pickup or car . Now if you can not figure it out then it is best left to a TRUCK MECHANIC that knows how to get them to work and the older the guy is the more he knows . Oh one other thing is since it and old truck myself i would replace every hose and line on it it is a real sickening feeling when ya do get them worken to have them blow a line as they do not have a dual system and ya ain't going to stop. BTDT.

[Log in to Reply]  [No Email]
DaveCA

03-13-2006 05:48:09




Report to Moderator
 Re: ot/ Truck brakes Ok can this be done in reply to the tractor vet, 03-11-2006 10:10:05  
I"ve seen some, years ago, old juice braked trucks that did that. Sometime you have to: loosen the adjusters , then bleed the brakes , then adjust them up.

Works sometimes.



[Log in to Reply]  [No Email]
DaveCA

03-13-2006 06:06:24




Report to Moderator
 Re: ot/ Truck brakes Ok can this be done in reply to DaveCA, 03-13-2006 05:48:09  
OK, I read the posts the other day, came back and added my comment. I had forgotten what you had and had not done to your brakes. After re-reading the posts here:
You could still have a master cyl problem or some other. The master cylinder piston will normally reach a deeper portion of it"s cylinder when the line isn"t plugged off, because the brake shoes have to travel some. Sooo while the line plugging test should work, it isn"t 100% perfect. The tractor vet gave the right/safe answer.

[Log in to Reply]  [No Email]
don t.-9n180179

03-11-2006 03:09:31




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
Don't know if this may apply. I r&r'ed the brake system, including new lines, on a 72 GMC P/U. No matter what I did, pedal to the floor. Turned out the booster was bad.
HTH....don t. ....



[Log in to Reply]  [No Email]
Ron in Nebr

03-10-2006 22:15:21




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
Like the other posts said, it's more than likely a bad master cylinder. But, while you're checkin' things out- bad rubber brake hoses could also be the culprit- the ones between the wheel cylinders or calipers to the steel lines. Not too likely, but if it's an older vehicle check them out too. They get soft and will just swell up when pressure is applied...and they won't do it for long- they'll break soon.

[Log in to Reply]  [No Email]
Jack-Iowa

03-10-2006 18:49:14




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
thanks all for the input.
Never would of thought of plugging the master cylinder. Will try it in the am .
thanks again!



[Log in to Reply]  [No Email]
old

03-10-2006 16:41:11




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
Master ned to be rebuilt or replaced. With little or no load, I.E. bleeders open it will push fluid. Close bleeders and back to the floor it goes. The seals in the master are bad and or the bore is rusty or scored



[Log in to Reply]  [No Email]
azharry

03-10-2006 16:33:35




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
One of the best ways to ensure that your problem is actually the master cylinder is to remove the lines from the master cylinder and install solid plugs in their place. Step on the brake pedal, if it falls to the floor, the master cylinder is bypassing internally and needs to be replaced. However, if the pedal is firm and doesn't fall away, your problem is not the master cylinder. The solid plugs usually come with master cylinder bleed kits. Hope this helps.

[Log in to Reply]  [No Email]
the tractor vet

03-10-2006 16:17:27




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
Yep , adjust all the brakes then try again if you found no air then this should be your problem. Did i mentinshion that i hate juice brakes on trucks.



[Log in to Reply]  [No Email]
nballen

03-10-2006 15:46:57




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
Agreed! I helped rebuild the brakes on a 1950 International deuce-and-a-half - we did the all the wheel cylinders, but couldn't get rid of all the air (brakes were still REALLY soft!). Turned out to be the master cylinder.

Lesson learned: When I rebuild brakes, always plan on doing the whole system! Parts are cheap (relatively speaking).



[Log in to Reply]  [No Email]
Tim in OR

03-10-2006 15:35:03




Report to Moderator
 Re: ot/ Truck brakes in reply to Jack-Iowa, 03-10-2006 15:29:36  
If the master cylinder resevoir was and still is full, I would bet on the master cylinder being toast. When bleeding the wheel cylinders, you are not building enough pressure for the master cylinder to bypass its self.
Best of luck
Tim in OR



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy